LLM Observability for Anthropic SDK

Overview

Laminar automatically instruments the official Anthropic package with a single line of code, allowing you to trace and monitor all your Anthropic API calls without modifying your existing code. This provides complete visibility into your AI application’s performance, costs, and behavior.

Getting Started

TypeScript
Python

1. Install Laminar and Anthropic

npm install @lmnr-ai/lmnr@latest @anthropic-ai/sdk@latest

2. Set up your environment variables

Store your API keys in a .env file:

# .env file
LMNR_PROJECT_API_KEY=your-laminar-project-api-key
ANTHROPIC_API_KEY=your-anthropic-api-key

Then load them in your application using a package like dotenv.

Using Anthropic inside Next.js? The Vercel AI SDK page covers the Next.js-specific setup (serverExternalPackages, instrumentation.ts, and Laminar.patch for direct SDK clients).

3. Initialize Laminar

Just add a single line at the start of your application or file to instrument Anthropic with Laminar.

import { Laminar } from '@lmnr-ai/lmnr';
import Anthropic from '@anthropic-ai/sdk';
import 'dotenv/config'; // Load environment variables

// This single line instruments all Anthropic API calls
Laminar.initialize({
  instrumentModules: { anthropic: Anthropic }
});

// Initialize Anthropic client
const anthropic = new Anthropic.Anthropic();

import Anthropic from '@anthropic-ai/sdk' imports the module. Pass it to instrumentModules, then create the client with new Anthropic.Anthropic().

4. Use Anthropic as usual

// Make API calls to Anthropic as you normally would
const response = await anthropic.messages.create({
  model: "claude-sonnet-4-5",
  max_tokens: 1024,
  messages: [
    { role: "user", content: "Hello, how are you?" }
  ],
});

console.log(response.content);

All Anthropic API calls are now automatically traced in Laminar.

1. Install Laminar and Anthropic

pip install -U 'lmnr[all]' anthropic python-dotenv

2. Set up your environment variables

Store your API keys in a .env file:

# .env file
LMNR_PROJECT_API_KEY=your-laminar-project-api-key
ANTHROPIC_API_KEY=your-anthropic-api-key

To see an example of how to integrate Laminar within a FastAPI application, check out our FastAPI integration guide.

3. Initialize Laminar

Just add a single line at the start of your application or file to instrument Anthropic with Laminar.

from lmnr import Laminar
from anthropic import Anthropic
import os
from dotenv import load_dotenv

# Load environment variables from .env file
load_dotenv()

# This single line instruments all Anthropic API calls
Laminar.initialize()

# Initialize Anthropic client as usual
client = Anthropic()

4. Use Anthropic as usual

# Make API calls to Anthropic as you normally would
response = client.messages.create(
    model="claude-sonnet-4-5",
    max_tokens=1024,
    messages=[
        {"role": "user", "content": "Hello, how are you?"}
    ]
)

print(response.content)

All Anthropic API calls are now automatically traced in Laminar.

These features allow you to build more structured traces, add context to your LLM calls, and gain deeper insights into your AI application’s performance.

Monitoring Your Anthropic Usage

After instrumenting your Anthropic calls with Laminar, you’ll be able to:

View detailed traces of each Anthropic API call, including request and response
Track token usage and cost across different models
Monitor latency and performance metrics
Open LLM span in Playground for prompt engineering
Debug issues with failed API calls or unexpected model outputs

Visit your Laminar dashboard to view your Anthropic traces and analytics.

Advanced Features

Enrich traces with sessions, user IDs, metadata, and tags via the SDK reference.
Wrap custom functions with observe to capture business logic alongside model calls (see the SDK reference).

Overview

Tracing

Signals

Debugger

Evaluations

Datasets

Platform

Overview

Getting Started

1. Install Laminar and Anthropic

2. Set up your environment variables

3. Initialize Laminar

4. Use Anthropic as usual

1. Install Laminar and Anthropic

2. Set up your environment variables

3. Initialize Laminar

4. Use Anthropic as usual

Monitoring Your Anthropic Usage

Advanced Features

​Overview

​Getting Started

​1. Install Laminar and Anthropic

​2. Set up your environment variables

​3. Initialize Laminar

​4. Use Anthropic as usual

​1. Install Laminar and Anthropic

​2. Set up your environment variables

​3. Initialize Laminar

​4. Use Anthropic as usual

​Monitoring Your Anthropic Usage

​Advanced Features

Overview

Getting Started

1. Install Laminar and Anthropic

2. Set up your environment variables

3. Initialize Laminar

4. Use Anthropic as usual

1. Install Laminar and Anthropic

2. Set up your environment variables

3. Initialize Laminar

4. Use Anthropic as usual

Monitoring Your Anthropic Usage

Advanced Features